- Prepared by: Terry Lewis
Tasks
- Water and mow lawn. Set mower higher to shade out weeds and keep roots cool.
- Be cautious when applying sulfur to grapevines for mildew control. Damage occurs above 100°F.
- Trap, hand-pick or bait snails, slugs and earwigs. (See UC IPM pest note on snail and slug management.)
- Deeply water fruit and nut trees. Ideally, mature fruit trees should be irrigated to a depth of 3 feet.
Pruning
- Remove any unwanted sprouts on trunks of trees.
- Thin fruit trees allowing 4 to 6 inches between fruit.
- Deadhead roses to encourage repeat blooming.
- Remove dead branches from shrubs and trees.
Fertilizing
- Feed bedding plants with all-purpose fertilizer high in phosphorus.
- Feed vegetables and lawns with all-purpose fertilizer.
Planting
- Spring planting season is over. Anything planted this month will need careful watering.
- Fill in bare spots from earlier plantings of perennials and annuals.
- This is the last opportunity to transplant young plants.
Enjoy now
- Annuals and perennials: California poppy (Eschscholzia), Lantana.
- Bulbs, corms, tubers: squill (Seilla), Iris, amaryllis (Hippeastrum).
- Trees, shrubs, vines: oleander (Nerium), violet trump vine (Clytostoma).
- Fruits and vegetables: melon, asparagus, cucumber.
Things to ponder
- A garden of native flowering plants requires less water, fertilizer and energy than a traditional landscape.
- Weed seeds may survive for many years; many common weed seeds will germinate after 20 years.
- Author: Ben Faber
You see them here, you see them there, you see those brown garden snails everywhere in the avocado trees this year. A wet year. What do you expect? Lush, beautiful tree growth, yeah. And when you come to harvest the fruit, the leaves and fruit are covered with snails. They are in your hand as soon as you go to pick the fruit.
It's especially noticeable on trees with a tight canopy with poor air circulation and canopy skirts down to the ground. Young GEM trees with their tight canopies and fruit low down and even in the leaf mulch, are especially prone in a wet year like this. We don't normally expect to see snails in avocados. They seem to go for citrus whether it's a wet or a dry year and growers are aware of the need for snail monitoring and control. But avocado growers can get caught off guard.
Snail feeding on fruit
Snails love the closed canopy which is more humid with direct contact to access from soil
So what do you do?
- Inspect young and topworked trees regularly for damage, especially during and after wet conditions. Be sure to distinguish the cause of damage. Caterpillars, earwigs, Fuller rose beetle, grasshoppers, and June beetles also chew tree foliage.
- Inspect surfaces for slimy or dry silvery trails characteristic of snails and slugs. Look for snails hidden under trunk wraps or other shelters near trunks.
- Modify cultural practices, encourage biological control, and exclude snails from canopies to provide good control.
- Prune the skirts up so that they are not touching the ground, but not so high that leaf mulch is blown away.
- Control weeds in young groves and groves where tree canopies are sparse as low vegetation favors snails.
- Retain dropped leaves and apply coarse organic mulch near trunks to retard snail numbers and to suppress root rot and weeds. Frequent microsprinkler irrigation encourages snail problems.
- Increase the interval between irrigations to the extent compatible with good tree growth. Trim branches that touch soil to restrict snail access to canopies and expose the soil surface to drying.
Birds and other small vertebrates, parasitic flies, and several types of predatory beetles commonly prey on snails. The predatory decollate snail (Rumina decollata, family Subulinidae) is widely distributed in southern California. Decollate snail is commercially available and legal for introduction only in certain San Joaquin Valley and southern California counties (Fresno, Imperial, Kern, Los Angeles, Madera, Orange, Riverside, Santa Barbara, San Bernardino, San Diego, Ventura, and Tulare counties). Decollate introductions are not recommended in avocado. Establishment of significant decollate numbers usually requires several years after introduction, and brown garden snail primarily is a pest when avocado trees are young.
Snails and slugs are repelled by copper. Commercially available bands of copper foil wrapped around trunks exclude snails. Another alternative is to add Bordeaux mixture to whitewash and paint 1 to 2 inch strip around the trunks of trees. Certain snail baits are available for spot applications. Molluscicides also kill predatory decollate snails. Pesticides are rarely warranted for mollusk control in avocado.
Read more at UC IPM
https://ipm.ucanr.edu/agriculture/avocado/brown-garden-snail/#gsc.tab=0
- Author: Barbra Pushies
It's time to come together and support the UC Master Gardener Program's mission, so save the date! May 17-18, from noon to noon, is the UC Master Gardener Program statewide giving day, UC ANR Giving Day. This special event invites you to help support our mission of extending sustainable gardening practices to thousands of community, school, and demonstration gardens across California. By donating to the UC Master Gardener Program, you can help bring the knowledge and resources of the University to your local community.
Get ready to dig deep, spread the word, and make a difference!
As gardeners, we understand the importance of sustainable practices in nurturing green spaces and preserving the natural environment. You can see the impact of the UC Master Gardeners in the stories of our Gardeners With Heart. These stories show the many ways our volunteers help our communities by supporting food access, protecting pollinator habitats, connecting communities through gardening, supporting sustainable landscaping, and research-backed education. By supporting the UC Master Gardener Program, you contribute to the advancement of sustainable gardening practices throughout the state, fostering healthier gardens and communities.
UC ANR Giving Day offers various ways for you to show your support and get involved. Whether you are an avid gardener, a passionate environmentalist, or simply someone who recognizes the value of sustainable practices, we'd love you to join us in supporting our mission.
Make a Gift:
Visit donate.ucanr.edu/givingday during the 24-hour giving day on May 16-17 (noon to noon). Every donation, regardless of size, significantly impacts the UC Master Gardener Program's ability to continue its valuable work. Whether you contribute $5 or $500, your support helps fund educational resources, expand our outreach programs, and provides training opportunities.
Help Spread the Word:
Mark your calendar and spread the word about UC ANR Giving Day! Share the event details with your friends, family, and fellow gardening enthusiasts. Encourage them to join you in supporting this important cause. Together, we can create a ripple effect of positive change by raising awareness and inspiring others to get involved.
Engage on Social Media:
On May 16-17, be part of the excitement by joining in the conversation on social media. Use the hashtag #GivingDay to share your support for UC ANR Giving Day. Let your online community know why sustainable gardening is important to you. Together, we can amplify our message and inspire others to take action.
UC ANR Giving Day is an opportunity to unleash the power of giving and support sustainable gardening practices across California. By supporting the UC Master Gardener Program and UC ANR, you contribute to the extension of knowledge and resources to communities across California. Remember to mark your calendar for May 16-17, and join in the celebration of sustainable gardening.
Let's dig deep, donate, spread the word, and make a lasting impact together!
To make a gift and learn more about UC ANR Giving Day, visit donate.ucanr.edu/givingday.
Next time you go for a walk in Upper Park, look closely at the different plants you see. Notice the enormous diversity of shapes, colors, and forms. There are trees, shrubs, perennials and annuals, all different shapes and sizes of leaves, and tremendous variation in flower color and structure from one species of plant to another. This diversity is the result of evolution over the ages. Plants have adapted to the specific conditions of their native habitat. These conditions include climate, availability of water, soil type, and interactions with other organisms. Adaptations can be structural or physiological.
The beavertail cactus (Opuntia basilaris) is a kind of prickly pear cactus. It lacks long spines but its flat, fleshy pads are covered with small bristles that have barbed tips. The bristles help shade the pads and also protect the cactus from being eaten. The pads themselves are modified stems. They have a waxy cuticle to reduce water loss and store water within. During periods of drought the pads shrivel and then plump back up when rain returns.
All plants have very small holes called stomata on the underside of their leaves. The hole can open for exchange of carbon dioxide and oxygen gases or close to maintain the proper balance of water. Most plants open their stomata during the day to take in carbon dioxide for photosynthesis. They close the stomata at night to retain water. Plants in the cactus family, plus some succulents and certain orchids, open their stomata at night and close them during the day. They have a modified photosynthetic cycle, called Crassulacean Acid Metabolism (CAM), which helps to reduce water loss during gas exchange. Carbon dioxide enters the open stomata at night when less water will be lost to the outside air. The carbon dioxide is then fixed and combined with another chemical to form an organic acid. The acid is then stored until the daytime when sunlight is available to finish the process of transforming it to sugar. CAM is an example of a physiological adaptation.
The forests of the Coastal Redwood (Sequoia sempervirens) are lush, green, and typically receive a generous amount of rainfall during the winter but little rain during the summer. How do the redwoods survive the dry season? While the North Coast doesn't get much rain in the summer, it does have regular fog. Scientists have long suspected that redwood leaves, especially those near the top of the tree, are able to absorb water from fog without adversely affecting photosynthesis. When stomata are covered by even a thin film of water, the water can block the flow of carbon dioxide into the leaf, limiting photosynthesis.
Think about plant adaptations when choosing plants for your garden. Generally speaking, the better a match between a plant's adaptations and the conditions in your garden, the better the plant will perform. If you choose a plant native to an area that is much different from your garden, you will probably need to make some changes in your garden so it can provide for more of the plant's needs.
Want to learn more about this topic? Attend our workshop on Adaptations of California Native Plants (Wednesday, May 22), part of the Master Gardeners' 2024 Spring Workshop Series. For information about all the workshops, and to register, visit our website. All workshops are free, but registration is required.
PLANT SALE! Mark your calendar for our plant sale on Saturday, May 18, 2024 from 9 am–noon. The sale will be held at the Master Gardeners Demonstration Garden at Patrick Ranch. The plants, which are selected to thrive in our climate, have been propagated by UC Master Gardeners of Butte County. For more information and a partial list of the plants that will available, visit our website.
UC Master Gardeners of Butte County are part of the University of California Cooperative Extension (UCCE) system. To learn more about us and our upcoming events, and for help with gardening in our area visit our website. If you have a gardening question or problem, email the Hotline at mgbutte@ucanr.edu or leave a phone message on our Hotline at 530-552-5812. To speak to a Master Gardener about a gardening issue, or to drop by the MG office during Hotline hours, see the most current information on our Ask Us section of our website.
- Author: Diana Cervantes
From her Hmong family's roots to the vast expanses of Fresno's fields, Lilian Thaoxaochay weaves a story of unwavering commitment to the land and community. Thaoxaochay shares her knowledge of revitalizing and strengthening agriculture in the San Joaquin Valley, acquired from her childhood among crops to her academic training in medical anthropology and agriculture.
Thaoxaochay, who grew up in the San Joaquin Valley, joined the UC Agriculture and Natural Resources (UC ANR) three years ago as a UC Cooperative Extension community educator for small farms in Fresno County. Since then, Thaoxaochay has extended a helping hand to small-scale Southeast Asian farmers.
When she joined UC ANR in 2021, she became part of an integrated team addressing the COVID-19 pandemic. Because most information about COVID-19 was in English, Thaoxaochay and her team translated information about the vaccination process into other languages for farmers in the region. Her Hmong heritage came in handy for the task.
"We went out into the countryside to raise awareness among residents about the importance of getting vaccinated," explained Thaoxaochay, "The Hmong community faces barriers such as language and culture."
She is a first-generation Hmong American in her family of six generations of hard-working farmers. While Thaoxaochay helped on the farm as a child, she absorbed every detail of farm life. Over time, her love of agriculture and interest in human culture and society gave her a new vision for her future.
Determined to explore this connection more deeply, Thaoxaochay embarked on an academic journey that led her to earn a bachelor's degree in medical anthropology at Stanford University and later a master's degree in Southeast Asian agriculture at the University of California Santa Cruz. Armed with her deep knowledge of both the field and the community, Thaoxaochay returned to the San Joaquin Valley with renewed purpose. Besides helping on the family farm, she dedicated herself to sharing her knowledge and experiences with other farmers and community members.
Through workshops, talks and research projects, Thaoxaochay addresses the various challenges small-scale farmers face in the valley, ranging from water scarcity to environmental and economic concerns. She advocates for solutions that will benefit farmers and the community.
Her strong ties to the Hmong community have contributed to her successful career with UC ANR. "Part of my success is growing up on a farm in the San Joaquin Valley, which allows me to understand the needs of smallholder farmers," says Thaoxaochay. "Like when a farmer had problems with his crop because of the water, but no one had asked him anything about it. Nobody knew about the big water problem in the San Joaquin Valley."
Over time, Thaoxaochay's work has strengthened the bonds between farmers and the community. Her story is about a young woman who grew up in the fields and became a passionate advocate for her community. She has become known for her dedication, knowledge and love for the land.
Thaoxaochay has been influenced by strong women including Yuri Kochiyama, a Japanese-American who was incarcerated with her family in a concentration camp in Arkansas during World War II and began championing civil rights for Asian American, Black and Third World people in the 1960s. "I have great admiration and respect for activist Yuri Kochiyama, whom I met in 2008 at a dinner," she recalls.
And while the age difference between Lilian and Kochiyama is significant—at least 69 years apart—the two share the same thinking. As Asian American women, they both pursue a passion for community and justice.
"Yuri's legacy drives my determination to represent and express the needs of those I serve," Thaoxaochay said.
In May we celebrate the contributions of Asian Americans and Pacific Islanders, recognizing their power, courage and resilience. Thaoxaochay, who is paving the way for future generations, invites other Asian women not to be afraid to take risks. "Mistakes don't mean failure. Rather, they offer opportunities and possibilities for empathy, growth and development, which I consider important lessons in pursuing any dream."